package com.tegtech.core.interceptor.impl;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;

import com.tegtech.common.utils.http.HttpHelper;
import com.tegtech.common.utils.ip.IpUtils;
import com.tegtech.core.filter.RepeatedlyRequestWrapper;
import com.tegtech.core.interceptor.RepeatSubmitInterceptor;
import com.tegtech.starter.redis.service.RedisCacheHelper;

import cn.hutool.core.map.MapUtil;
import cn.hutool.json.JSONUtil;

/**
 * 判断请求url和数据是否和上一次相同， 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 * 
 * @author Jun
 */
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {
	
	public final String REPEAT_PARAMS = "repeatParams";

	public final String REPEAT_TIME = "repeatTime";
	
	public final String CACHE_REPEAT_KEY = "repeatData";

	/**
	 * 间隔时间，单位:秒 默认10秒
	 * 
	 * 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
	 */
	private int intervalTime = 10;

	public void setIntervalTime(int intervalTime) {
		this.intervalTime = intervalTime;
	}

	@Override
	public boolean isRepeatSubmit(HttpServletRequest request, int intervalTime) {
		this.setIntervalTime(intervalTime);
		
		RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
		String nowParams = HttpHelper.getBodyString(repeatedlyRequest);

		// body参数为空，获取Parameter的数据
		if (StringUtils.isEmpty(nowParams)) {
			nowParams = JSONUtil.toJsonStr(request.getParameterMap());
		}
		Map<String, Object> nowDataMap = new HashMap<String, Object>();
		nowDataMap.put(REPEAT_PARAMS, nowParams);
		nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());

		// ip + 请求地址（作为存放cache的key值）
		String url = IpUtils.getIpAddr(request) + request.getRequestURI();
		
		Map<String, Object> preDataMap = RedisCacheHelper.instance.hget(CACHE_REPEAT_KEY, url);
		if(MapUtil.isNotEmpty(preDataMap) && compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap)) {
			return true;
		}
		RedisCacheHelper.instance.hset(CACHE_REPEAT_KEY, url, nowDataMap, intervalTime);
		return false;
	}

	/**
	 * 判断参数是否相同
	 */
	private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap) {
		String nowParams = (String) nowMap.get(REPEAT_PARAMS);
		String preParams = (String) preMap.get(REPEAT_PARAMS);
		return nowParams.equals(preParams);
	}

	/**
	 * 判断两次间隔时间
	 */
	private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap) {
		long time1 = (Long) nowMap.get(REPEAT_TIME);
		long time2 = (Long) preMap.get(REPEAT_TIME);
		return (time1 - time2) < (this.intervalTime * 1000);
	}
	
}
